<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" title="解决头条">
      <div slot="left" @click="$router.back()">
        <van-icon name="arrow-left" />
      </div>
    </van-nav-bar>
    <!-- /导航栏 -->
    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div
        v-else-if="article.title"
        ref="ArticleContent"
        class="article-detail"
      >
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>

          <followUser
            :isFollowed="article.is_followed"
            :articleId="article.aut_id"
            @update-is_followed="article.is_followed = $event"
          ></followUser>
          <!-- <van-button
            v-if="article.is_followed"
            class="follow-btn"
            round
            size="small"
            @click="onFollow"
            :loading="followLoading"
            >已关注</van-button
          >

          <van-button
           :loading="followLoading"
            @click="onFollow"
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            >关注</van-button
          > -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="article.content"
        ></div>
        <van-divider>正文结束</van-divider>

        <!-- 评论列表 -->
        <CommentList
          :source="article.art_id"
          @onload-success="totalCommentCount = $event.total_count"
          :list="CList"
          @reply-click="onRepyClick"
        ></CommentList>
        <!-- 评论列表 -->

        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            @click="isPostShow = true"
            class="comment-btn"
            type="default"
            round
            size="small"
            >写评论</van-button
          >
          <van-icon name="comment-o" :info="totalCommentCount" color="#777" />

          <CollectArticle
            v-model="article.is_collected"
            :articleId="article.art_id"
          ></CollectArticle>
          <!-- <van-icon color="#777" name="star-o" /> -->
          <!-- <van-icon color="#777" name="good-job-o" /> -->
          <LikeArticle
            v-model="article.attitude"
            :articleId="article.art_id"
          ></LikeArticle>
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->

        <!-- 评论弹框位置 -->
        <van-popup
          v-model="isPostShow"
          position="bottom"
          :style="{ height: '30%' }"
        >
          <!-- 如果评论文章 则 传入文章的id,如果回复则传入回复的id -->
          <CommentPost
            :target="article.art_id"
            @post-success="onPostSuccess"
          ></CommentPost>
        </van-popup>
        <!-- 评论弹框位置 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="this.errorStatus == 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 评论回复 -->

    <van-popup
      v-model="isReplyShow"
      position="bottom"
      :style="{ height: '100%' }"
    >
      <commentReply
        v-if="isReplyShow"
        :comment="currentComment"
        @close="isReplyShow = false"
      ></commentReply>
    </van-popup>

    <!-- /评论回复 -->
  </div>
</template>

<script>
import { getArticleById } from '@/api/article.js'

import { ImagePreview } from 'vant'
import followUser from '@/components/follow-user'

import CollectArticle from '@/components/collect-article'
import LikeArticle from '@/components/like-article'

import CommentList from './components/comment-list'

import CommentPost from './components/comment-post.vue'
import commentReply from './components/comment-reply.vue'

export default {
  name: 'ArticleIndex',
  components: {},
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true,
    },
  },
  //   给所有的后代组件提供数据;
  provide() {
    return {
      crticleId: this.articleId,
    }
  },
  data() {
    return {
      article: {},
      loading: true, //加载状态
      errorStatus: 0, //加载失败的状态;
      totalCommentCount: 0, // 评论总数!
      isPostShow: false, //是否弹出弹框;
      CList: [], //评论列表
      isReplyShow: false,
      currentComment: {}, //储存二级评论内容;
    }
  },
  computed: {},
  // eslint-disable-next-line no-dupe-keys
  components: {
    followUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
    commentReply,
  },
  watch: {},
  created() {
    this.loadArticle()
  },
  methods: {
    async loadArticle() {
      this.loading = true
      try {
        const {
          data: { data },
        } = await getArticleById(this.articleId)

        // if(Math.random()>0.8){
        //     JSON.parse("asd")
        // }
        this.article = data
        // console.log(data);
        // console.log(this.articleId);

        setTimeout(() => {
          this.PreviewImage()
        }, 0)
      } catch (err) {
        if (err.response && err.response.status == 404) {
          this.errorStatus = 404
        }
        console.log('获取数据失败!', err)
      }
      this.loading = false //不再加载;
    },
    PreviewImage() {
      //1.获取元素
      let imgs = [...this.$refs['ArticleContent'].querySelectorAll('img')]
      //   2.获取url(就是图片地址)
      let urls = imgs.map((item) => item.src)
      // 3.循环imgs
      imgs.forEach((item, index) => {
        item.onclick = () => {
          //绑定点击事件
          ImagePreview({
            //调用函数;
            images: urls,
            startPosition: index,
          })
        }
      })
    },

    onPostSuccess(data) {
      // 1.关闭弹出层
      this.isPostShow = false
      // 2.新发布的内容在顶部
      this.CList.unshift(data.new_obj)
      //   console.log("=========================");
      //   console.log(this.CList);
    },
    onRepyClick(data) {
      this.isReplyShow = true
      this.currentComment = data
      //   console.log(data);
    },
  },
}
</script>

<style scoped lang="less">
@import url('./github-markdown.css');
.article-container {
  /deep/.van-icon {
    color: #aaa !important;
  }
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
  /deep/.van-icon-arrow-left {
    color: #fff !important;
  }
  /deep/ .img {
    max-width: 90vw !important;
  }
}
</style>
